highaltitude.log.20081119

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[08:54] <Laurenceb> ello
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[15:01] <Laurenceb> hi edmoore
[15:01] <edmoore> yo
[15:01] Action: Laurenceb is working on a kalman filter
[15:02] <Laurenceb> http://pastebin.com/m76be7ab3
[15:02] <Laurenceb> do you have any IMU hardware?
[15:04] <epictetus> so, how many of you have girlfriends
[15:05] <Laurenceb> I love my ti-86
[15:05] <epictetus> I lost my TI-89 :(
[15:06] Nick change: Laurenceb -> Fritzl
[15:06] Action: Fritzl has it in his cellar
[15:06] Nick change: Fritzl -> Laurenceb
[15:08] <edmoore> good joke
[15:08] <edmoore> Laurenceb: what's it for?
[15:09] <Laurenceb> so you can find attitude?
[15:10] <Laurenceb> that script is a very minimal design, only three component state vector
[15:11] <Laurenceb> you give it an ascii file of time, roll pitch yaw rates and x y z accel readings
[15:11] <edmoore> ok cool
[15:11] <Laurenceb> it seems to work...
[15:11] <edmoore> i thought it might be gps-ey
[15:11] <Laurenceb> there may be a few typos in the error treatment stuff
[15:11] <Laurenceb> annoyingly someone nicked my matlab license
[15:12] <Laurenceb> I need to find another server
[15:12] <Laurenceb> I'd install octave but I dont have admin acess on this machine :(
[15:13] <edmoore> need that to be sorted
[15:13] <edmoore> your machine should be your own :)
[15:13] <Laurenceb> hehe some chance
[15:14] <Laurenceb> I've been using datafiles published on the sparkfun forum to test it
[15:14] <Laurenceb> did you say you'd got a sparkfun 5DOF IMU?
[15:16] <edmoore> yes, as far as i know
[15:16] <edmoore> it's the idg300 and some 3-axis accel on a breakout board
[15:16] <Laurenceb> cool
[15:16] <Laurenceb> you just need a third gyro to run this :P
[15:17] <epictetus> seriously though, do any of you have girlfriends
[15:17] <Laurenceb> do you?
[15:18] <Laurenceb> maybe some of us _are_ girls
[15:18] <epictetus> i'm married
[15:18] <epictetus> so yes, of course i have girlfriends
[15:18] <Laurenceb> sure you are... sure
[15:18] <Laurenceb> erm
[15:18] <edmoore> nope, single
[15:18] <Laurenceb> as well as your wife O_o
[15:19] <edmoore> Laurenceb: did you see the poor girl who let go of her tool bag?
[15:19] <Laurenceb> ?
[15:19] <Laurenceb> where
[15:19] <edmoore> she was doing a space walk at the time
[15:19] <Laurenceb> haha
[15:19] <Laurenceb> did it float away or was it recaptured?
[15:19] <edmoore> so there'll be a tool-bag re-entering at some point in the next few weeks
[15:20] <Laurenceb> rofl
[15:20] <gordonjcp> epictetus: why are you interested in how many people here have girlfriends?
[15:20] <gordonjcp> epictetus: are you looking for a girlfriend? boyfriend?
[15:20] <edmoore> he's come to the right place
[15:21] <epictetus> hah
[15:21] <epictetus> no i was just trying to figure out if you are as nerdy as I imagine
[15:21] <gordonjcp> what's nerdy got to do with it?
[15:21] <edmoore> almost certainly. maybe more
[15:21] <epictetus> well, i think to get into electronics/high altitude research
[15:22] <Laurenceb> theres plenty of nerdy girls here for you
[15:22] <epictetus> you need to have a certain level of nerdiness
[15:22] <gordonjcp> true
[15:22] <epictetus> seriously?
[15:22] <Laurenceb> indeed
[15:22] <gordonjcp> nerds get all the girls
[15:22] Action: Laurenceb looks around his desk
[15:22] <edmoore> well, I wouldn't have picked my degree if I didn't enjoy doing it, so i guess you're right
[15:23] <edmoore> it takes certain interests and inclinations to mess around at the edge of the atmosphere
[15:23] <Laurenceb> muhahaha
[15:23] Action: Laurenceb has a matlab license
[15:23] <edmoore> sometimes I wish I could have no interests at all, then i could work at macdonalds with all the cool people.
[15:23] <gordonjcp> my fiancee is trying to convince me to do a high altitude balloon launch, so she can fly her camera
[15:23] <edmoore> alas, blighted.
[15:25] <gordonjcp> maybe it's a local phenomena
[15:25] <gordonjcp> all the geeky types round here have really fit girlfriends, myself included
[15:26] <gordonjcp> despite owning a PDP11 and a complete set of factory workshop manuals for every car I own, I fear I may not yet be nerdy enough
[15:27] <epictetus> how fit?
[15:27] <epictetus> got pix?
[15:28] <Laurenceb> http://imagebin.org/31595
[15:28] <Laurenceb> there you go
[15:28] <edmoore> that's not gordonjcp's girlfriend
[15:28] <Laurenceb> its something much fitter
[15:29] <Laurenceb> sorry gordon
[15:29] <Laurenceb> well until 50 seconds
[15:29] <gordonjcp> not dropping docs on my gf, sorry
[15:29] <Laurenceb> then soething goes screwy
[15:29] <edmoore> Laurenceb: kalman filter plots are not fitter than girlfriends. I've called algorithm's sexy before, but...
[15:30] <Laurenceb> hehe
[15:30] <gordonjcp> epictetus: suffice it to say that one of my more geeky friends runs OpenVMS on an Alpha as his primary desktop machine
[15:30] <edmoore> gordonjcp: I'm be a much poorer student were it not for my haynes manual
[15:30] <Laurenceb> I think there must be a bug in thwe error treatment
[15:30] <Laurenceb> the way it goes a bit mad at 50S
[15:30] <Laurenceb> plotting the raw data looks ok
[15:30] <gordonjcp> epictetus: his gf is a catalogue model for a fetishwear company, so, you know, draw your own conclusions
[15:30] <Laurenceb> no anomalous points there
[15:30] <gordonjcp> edmoore: indeed
[15:32] <gordonjcp> edmoore: chain strap wrench: £19.99, set of workshop manuals for Citroen CX series 2: £25 from a workshop clearance, knowing the right procedure for depressurising the suspension before removing the spheres: Priceless
[15:32] <gordonjcp> otherwise, cost of cleaning up green oily gunk from a pavior block driveway: a *lot*
[15:33] <Laurenceb> edmoore: that code would run on an AVR
[15:33] <Laurenceb> 5ms runtime :D
[15:34] <edmoore> not bad!
[15:34] <Laurenceb> 6 state should be pretty trivial on ARM
[15:37] <Laurenceb> I've just ordered one of these http://www.micronradiocontrol.co.uk/images/gen/corona/rp4s1-35_500.png
[15:37] <Laurenceb> for the mini rogallo
[15:38] <edmoore> right, lecture
[15:38] <edmoore> bbl
[15:38] <edmoore> good luck on the quest, epictetus
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[15:48] <Ei5GTB_> evening
[15:48] Nick change: Ei5GTB_ -> EI5GTB
[16:37] <Laurenceb> hi
[16:38] <EI5GTB> hai
[16:38] <EI5GTB> how goes it?
[16:38] <Laurenceb> not so bad thanx
[16:39] <Laurenceb> http://imagebin.org/31597
[16:41] <EI5GTB> hmm
[16:42] <EI5GTB> is that the output of your calman filter?
[16:43] <EI5GTB> kalmn
[16:43] <EI5GTB> kalman*
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[16:50] <Laurenceb> yes
[16:50] <Laurenceb> with some data off the sparkfun forum
[16:50] <EI5GTB> cool
[16:50] <EI5GTB> howd you sim it>?
[16:50] <Laurenceb> I used matlab with the raw data
[16:50] <Laurenceb> http://imagebin.org/31599
[16:50] <Laurenceb> thats the data
[16:52] <EI5GTB> thats just rate of change data then..
[16:52] <Laurenceb> yeah, red,blue,green is rate gyros, magneta,black, cyan accels
[16:55] <EI5GTB> cool
[17:01] <EI5GTB> OK, AND THE FIRST IMAGE IS ALSO RATE OF CHANGE, BUT FILTERED FOR NOISE./.
[17:01] <EI5GTB> feckin caps
[17:02] <Laurenceb> no
[17:02] <Laurenceb> fiirst image is roll, pitch ,yaw
[17:03] <Laurenceb> i.e. your attitude solution
[17:04] <EI5GTB> ooh, ok
[17:04] <EI5GTB> so the kalman resolves the actual soloution aswell
[17:04] <Laurenceb> yes
[17:05] <Laurenceb> thats the point :P
[17:05] <EI5GTB> lol, k
[17:06] <Laurenceb> theres a bit of a glitch at 52 seconds... I think I've made a mistake somewhere but I still cant work it out
[17:07] <Laurenceb> that movement in roll and yaw isnt in the raw data
[17:08] <EI5GTB> hmmm
[17:10] <Laurenceb> I suspect one of my matrices is invalid
[17:11] <Laurenceb> but I need to derive all the trig by hand to be sure :-/
[17:11] <EI5GTB> gr, matricies... yet another thing i dont understand :'(
[17:16] <EI5GTB> you studied math at college?
[17:18] <Laurenceb> well I've got a degree in physics
[17:18] <Laurenceb> so I guess that counts
[17:19] <EI5GTB> grr, man, id love that
[17:20] <EI5GTB> would never be fit for it..
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[18:23] <naxxfish> hmm
[18:23] <naxxfish> does anyone have any notes on modelling the acceleration of an envelope?
[18:24] <naxxfish> i've been struggling for days with my rather limited physics-fu
[18:24] <EI5GTB> http://www.anpost.ie/AnPost
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[18:25] <EI5GTB> slow acceleration in this case
[18:25] <naxxfish> >_<
[18:25] <naxxfish> i was talking about balloons, but whatever :p
[18:25] <EI5GTB> haha, i know
[18:26] <EI5GTB> i have such a lack of knowledge in that field that i comensated by making a funnie
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[18:54] <Kornholijo> hiho
[18:56] <EI5GTB> anyone here do electronic engineering at college?
[19:11] <Kornholijo> not yet, but maybe I will, why?
[19:32] <Hiena> Daily work is count?
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[19:44] <Kornholijo> hi jcoxon
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[19:57] <EI5GTB> Kornholijo, just wondering what its like... think ong of doing it
[20:01] <Laurenceb> hi guys
[20:01] <EI5GTB> howdy
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[20:06] <rjharrison> Evening all
[20:06] <rjharrison> jcoxon you arround sir
[20:07] <rjharrison> Bloody weather is crap atm
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[21:02] <Laurenceb> hmf IMUs seem to be inherently unstable
[21:03] <EI5GTB> haha
[21:03] <Laurenceb> a bit of gyro noise whilst turning on one way can cause the system to go off into another state
[21:03] <EI5GTB> huh?
[21:03] <gordonjcp> feed the values to a synthesizer
[21:03] <gordonjcp> stick it on last.fm
[21:03] <Laurenceb> basically the way the gyro inputs are interpretted
[21:04] <Laurenceb> is a function of the attitude
[21:04] <Laurenceb> which is a function of the gyros
[21:04] <Laurenceb> so it can wind itself up quite easily
[21:04] <Laurenceb> under certain operating conditions
[21:05] <Laurenceb> going 6 state may help
[21:08] <Kornholijo> hiho
[21:08] <Kornholijo> whats up Laurenceb
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[21:14] <Laurenceb> not so bad
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[21:24] <Ei5GTB_> Laurenceb, deos 6 state involve more hardware or software?
[21:24] <Laurenceb> its software
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[21:31] <Ei5GTB_> ahh, i see
[21:31] <Ei5GTB_> when i get a chance i must read into all this
[21:31] <Ei5GTB_> its bugging me not understanding
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[23:09] <jcoxon> ping edmoore
[23:09] <natrium42> hey, i got the ping too
[23:09] <natrium42> must have been wrongly addressed
[23:09] Action: natrium42 resends
[23:09] <natrium42> ping edmoore
[23:09] <jcoxon> strange
[23:10] <EI5GTB> hard to beat a good ping in the evening
[23:11] <EI5GTB> im in ur irc stealin ur pingz
[23:11] <jcoxon> lol
[23:13] <natrium42> /quit EI5GTB
[23:13] <natrium42> :D
[23:13] <EI5GTB> :P
[23:13] <EI5GTB> i can haz ping?
[23:14] <natrium42> no can has
[23:14] <EI5GTB> i haz a sad
[23:25] <EI5GTB> hmm, michael buble, im comin' home
[23:25] <EI5GTB> song!
[23:31] <jcoxon> grrrr, looking for amateur radios and there are some many extras you have to get
[23:31] <natrium42> like ic-7000? :)
[23:32] <jcoxon> you need power supples
[23:32] <jcoxon> nothing is cheap
[23:33] <natrium42> i use a computer PS
[23:33] <natrium42> 12V lines
[23:33] <jcoxon> oooo thats quite a good idea
[23:33] <jcoxon> i have a spare one
[23:34] <natrium42> just make sure it can deliver the power on the 12V lines
[23:35] <jcoxon> then you've got to get an antenna
[23:35] <jcoxon> hehe
[23:36] <edmoore> ping jcoxon, natrium42
[23:36] <rjharrison> Oh the worries of hamming
[23:36] <rjharrison> is that a verb
[23:36] <rjharrison> evening edmoore
[23:36] <natrium42> hi edmoore & rjharrison
[23:36] <jcoxon> hey edmoore
[23:36] <edmoore> it actually has a fairly specific meaning in digital communications
[23:37] <edmoore> forward error correction technique
[23:37] <edmoore> so it's actually a noun/adjective (hamming code)
[23:37] <jcoxon> what was the sensitvity of the ft-790r? can you remember?
[23:37] <edmoore> 0.16uV
[23:37] <jcoxon> okay, thanks
[23:37] <EI5GTB> computer psus can give allot of noise on hf bands
[23:37] <EI5GTB> you can be both nluck and/or unlucky
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[00:00] --- Thu Nov 20 2008